Silvering apparatus.



I F. W. BARTLETT. SILVERING APPARATUS. APPLICATION FILED SEPT-27, 1913.

Patented Apr" 13, 1915.

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T. Inventor: FITQCAQTIC K W. Bartlet FREDERICK W. BARTLETT, 0F CALDWELL BOROUGH, NEW JERSEY.

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Specification of Letters Patent. Patented Apr. 113, 1915.,

Application filed September 27, 1913. Serial No. 792,207.

To all whom it may concern:

Be it known that I, FREDERICK W. BART- n'r'r, citizen of the United States, residing at borough of Caldwell, in the county of Essex and State of New Jersey, have invented certain new and useful llmprove ments in Silvering Apparatus, of which the following is a specification.

-This invention relates to the manufacture of so-called vacuum bottles, which are receptacles having a double wall with the space between said walls evacuated. In order to improve the thermal insulation efl'ected by the vacuum, the inner surfaces of the vacuum chamber are coated with a reflecting substance, preferably a deposit of silver.

The present invention has especial reference to the production of this reflecting surface, and it consists in an apparatus by which a measured quantity of the silvermg fluids can be easily introduced into the interwall space.

The object of the invention is to facilitate production, obtain a more uniform product,

and economize in the silvering solutions.

The apparatus is shown in the accompanying drawings in which Figure 1 is a front elevation, and Flg. 2 is a sectional elevation on a vertical plane transverse to Fig. 1.

On a suitable support 1 are placed two reservoirs 2, 2, one containing the silver solution and the other the reducing agent. From the lower end of each reservoir a pipe 3, 3 conducts the liquid to a flow controlling device such as a stop cock 4, 4, preferably of the turning plug variety. Below the stop cock is a measuring bulb 5, 5' having an upper neck connected with said stop cock, and a lower neck connected to a flow controlling device, such as a discharge cock 6, 6, also of the turning plug type. From the bulb a vent pipe '7, 7' rises to a point above the level of the liquid in the reservoir. The discharge cocks connect with the two arms of a if pipe 8which leads to a flow controlling device such as a three-way cock 9. Que port of this three-way cock communicates with a flexible tube 10 which can he slipped over the tubulature 11 extending from the bottom of the bottle 12 and communicating with its interwall space. The other-port of the three-way cock connects with a pipe 13 leading from a vacuum pump.

The handles 14, 14' of the stop cocks 4, 4t,

and the handles 15, 15 of the discharge cocks .6, 6 are all pivotally connected to a rod 16 which in turn is pivoted to a lever 17, fulcrumed at 18 and extending out in front of the base plate 19 of the apparatus. The handle 20 of the three-way cock is connected by a link 21 with this same lever, which works adjacent to an arc-shaped guide strip 22 provided with an adjustable stop 23. A small clamping lever 24 is \ful c'rumed to the base plate and extends across the flexible tube 10. A pivoted spring catch 25 has notches to engage with said clamping lever 24, which serves, when depressed, to pinch said tube and prevent the flow of air or liquid through it.

The two solutions are preferably used in equal quantities, so that the measuring bulbs are of the same size.

The operation is as follows: The bottle to be silvere'd having been connected by' its tubulature to the tube 10, the lever 17 is raised slightly to turn the three-way cock 9 to the position in which it connects the bottle with the vacuum line, by which a vacuum is created in the interwall space. The lever 17 is then depressed, cutting 01f the vacuum pipe and leaving a region of low pressure in the interwall space of the bottle. Continued downwardmovement of the lever 17 opens the stop cocks 4, 4: to permit the solutions to flow from the reservoirs into the measuring bulbs, the air therein escaping through the vent pipe. ward movement of the lever against the stop' 23 cuts ofl the solution and opens the discharge cocks 6, 6'- to allow the solution to mix in the stem of the it pipe 8 from which they are sucked into the bottle by the vacuum A further downin its interwall space. The clamping lever 24L is then depressed to pinch the tube 10 and prevent any leakage of. the solutions while the bottle is removed from the tube and a fresh one attached thereto. The solutions can be reduced by subjecting them to 'heat in another apparatus.

justing the stop 23 this quantity can be varied to suit difi'erent sizes of bottles.

In accordance with the provisions of the patent statutes, T have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodimentthereof; but I desire to'have it understood that'the apparatus shown is only illustrative, and that the invention can be carried out by other means.

Having thus described my invention, what I claim and desire to secure byvLetters Patent is:

1. Apparatus for silvering vacuum bottles, comprisingreservoirs for the silvering and. reducing solutions, measuring bulbs connected with said reservoirs, flow-controlling devices between said reservoirs and bulbs, a mixing tube connected with said bulbs, flow-controlling devices between said bulbs and tube, means for connecting said tube with the bottles to be silvered, said means being provided with flow-controlling devices, and operative connections vbetween all of said flow-controlling devices whereby the continuous operation of said connections will first admit both solutions into their measuring bulbs, then shut off the flow from the reservoir and admit the measured quan tities of both solutions to the mixing tube.

2. Apparatus for silvering vacuum bottles, comprising reservoirs for the silvering and reducing solutions, measuring bulbs connected with said reservoirs and provided reservoirs and bulbs,

a mixing tube connected with said bulbs,

discharge cocks between said bulbs and said mixing tube, and means for simultaneously opening said stop cocks and then closing them and subsequently opening said discharge cocks.

3. Apparatus for silvering vacuum bottles, comprising reservoirs for the silvering and reducing solutions, measuring bulbs connected with said reservoirs, stop cocks between said reservoirs and bulbs, a mixing tube connected with said bulbs, discharge cocks between said bulbs and mixing tube, a three-way cock connected to said mixing tube, a vacuum pipe connected to said threewaycock, a flexible pipe connected to said three-way cock, and a single means for opening and closing allof said cocks in the proper order to first create a vacuum in the interwall space of the bottle, then measure out a definite quantity of each solution, then cut off the solutions and admit them to the mixing tube and the bottle.

In testimony whereof I aflix my signature in presence of two witnesses.

FREDERICK W. BARTLETT.

Witnesses:

ARTHUR D. CRANE, JOSEPH N. Tom. 

